13. Distinguish between relative speed and relative velocity
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When two bodies are moving in the same direction, the relative speed is computed by their difference. ... The difference between relative speed and relative velocity is that relative speed is the scalar quantity whereas relative velocity is the vector quantity.
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Tʜᴇʀᴇ ɪs ɴᴏ ᴍᴜᴄʜ ᴅɪғғᴇʀᴇɴᴄᴇ ʙᴇᴛᴡᴇᴇɴ ᴛʜᴇᴍ .
Dɪғғᴇʀᴇɴᴄᴇ ɪs sᴀᴍᴇ ᴀs ɪɴ Sᴘᴇᴇᴅ ᴀɴᴅ Vᴇʟᴏᴄɪᴛʏ
➡️ Vᴇʟᴏᴄɪᴛʏ - Dɪʀᴇᴄᴛɪᴏɴ ᴀɴᴅ Mᴀɢɴɪᴛᴜᴅᴇ
Vᴇʟᴏᴄɪᴛʏ ᴄᴀɴ ʙᴇ ɴᴇɢᴀᴛɪᴠᴇ ʙᴇᴄᴀᴜsᴇ ɪᴛ ᴅᴇᴘᴇɴᴅs ᴜᴘᴏɴ ᴀʟsᴏ ᴏɴ Dɪʀᴇᴄᴛɪᴏɴ
➡️ Sᴘᴇᴇᴅ - Mᴀɢɴɪᴛᴜᴅᴇ
Sᴘᴇᴇᴅ ᴄᴀɴ ʙᴇ ɴᴇɢᴀᴛɪᴠᴇ ʙᴇᴄᴀᴜsᴇ ᴅᴇᴘᴇɴᴅs ᴜᴘᴏɴ ᴏɴʟʏ ᴍᴀɢɴɪᴛᴜᴅᴇ
Lᴇᴛ V & V’ Is ᴠᴇʟᴏᴄɪᴛʏ ᴏғ ᴛᴡᴏ ᴏʙᴊᴇᴄᴛs .
➡️ Tʜᴇɴ, Rᴇʟᴀᴛɪᴠᴇ ᴠᴇʟᴏᴄɪᴛʏ ᴡɪʟʟ ʙᴇ = V - V’
Tʜᴇɴ ʀᴇʟᴀᴛɪᴠᴇ sᴘᴇᴇᴅ ᴡɪʟʟ ʙᴇ ᴍᴏᴅᴜʟᴜs (ᴛᴏ ᴍᴀᴋᴇ sᴘᴇᴇᴅ ᴘᴏsᴛɪᴠᴇ) ᴏғ Vᴇʟᴏᴄɪᴛʏ.
Tʜᴇɴ
➡️ Rᴇʟᴀᴛɪᴠᴇ sᴘᴇᴇᴅ = |V - V’|
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